At startup the oil pressure gauge indicates 40 psi and then decreases to 20 psi and at times to zero until I accelerate. After awhile and as the engine warms up the pressure fluctuates between 20 psi and 40 psi. With 27,300+ miles my mechanic feels if he removed the oil pan to investigate the down tube and o-ring it would be more of an autopsy. Considering the mileage would repairing the oil pressure problem be advisable?

8 Answers

It may just be a bad ,oil sending unit not reading right,check it and guage
before tearing into it,and if he doe,s tear into,it wont be and o ring,or down
tube,it will be a bad oil pump.And yes with that low of mile,s the truck is
worth the work.

Oh,k ,,,that help,s,,now the question is,if motor run,s good,and tranny is
good,meaning no knock,s or tick,s no smoke,it would probably be worth
it,but if it has any of the above issue,s,,not worth it.

Trans is new, one year old, runs incredibly strong, new tires, alternator,
fuel pump and some interior repairs to driver's seat.
However, there is a noise but not able to tell if its an exhaust leak or a
lifter.... ?

I have a 2007 suburban with 140k When you start it
up the oil pressure is around 40psi. After it runs for
5min it drops down to 0. No noise runs strong. We
changed the sending unit and still does the same
thing. Your thoughts?

Your Answer

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